JP2015120469A - Vehicle suspension system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suspension device for a vehicle which is effective in avoiding a large collision load from acting on an a cabin at the time of small overlap collision of a vehicle.SOLUTION: In a suspension device 10 of a vehicle, each of a pair of bracket members of a bracket 31 fixed to a suspension member 30 holds a bush 22 by a connection shaft force that is generated when a bolt shaft part of a bolt-nut connection body 25 is inserted into a through hole of the bush 22 and slots of the pair of bracket members, so as to be screwed into a nut part. A plate thickness in axial direction of a bolt shaft part of each of the pair of bracket members is set so that the bolt shaft part has a smaller connecting shaft force when at a second position than at a first position in the slot.

Description

  The present invention relates to a suspension device mounted on a vehicle.

  In one of the vehicle suspension devices disclosed in Patent Document 1 (hereinafter referred to as “conventional device”), the suspension arms that support the front wheels have two different locations in the vehicle front-rear direction (the front coupling portion and It is connected to the suspension member at the rear connecting part). Specifically, in the suspension arm, each of the first bush provided on the front connecting portion and the second bush provided on the rear connecting portion is bolted to each bracket provided on the suspension member. -It is fastened and fixed to each bracket by a nut fastener.

  In addition, this conventional device has a structure that absorbs the collision load by deforming the suspension member or the like by the collision load at the time of the vehicle collision. Specifically, this conventional apparatus is a member in which a collision load from an object to be collided (for example, an end portion of a wall and a column) is positioned ahead of the vehicle relative to the front wheel among suspension members during an offset collision of the vehicle. When acting on the front end portion, the suspension member is configured to absorb the collision load by being compressed and deformed so as to be crushed toward the rear of the vehicle.

JP 2009-113541 A

  By the way, as one of the offset collisions of the vehicle, a collision mode in which the contact area between the vehicle body and the collision object is shifted to one side at both ends in the vehicle width direction, a so-called “small overlap collision” is known. ing. In this small overlap collision, the collision load is not directly applied from the collision object to the suspension member, and the “front wheel and the end of the cabin (member component) etc. existing at the end in the vehicle width direction” from the collision object. In many cases, a collision load is directly applied to the. For this reason, in the said conventional apparatus, not only cannot it absorb an impact load, but there exists a possibility that a front wheel may move toward the cabin of vehicle rear as it is with a collision target object. Accordingly, a suspension device that can avoid a large collision load on the cabin during a small overlap collision is desired.

  The present invention has been made to address the above-described problems. That is, one of the objects of the present invention is to provide a vehicle suspension device that is effective in avoiding a large collision load from being applied to the cabin during a small overlap collision of the vehicle.

  In order to achieve the above object, a vehicle suspension apparatus according to the present invention includes a suspension member fixed to a vehicle body, a suspension arm, and a bracket. The suspension arm is interposed between a knuckle for supporting the front wheel and the suspension member. The suspension arm has a first connected portion connected to the suspension member and a second connected portion connected to the suspension member at the rear of the vehicle relative to the first connected portion. The bracket is fixed to the suspension member and holds the first connected portion and the second connected portion of the suspension arm.

  In the suspension device configured as described above, the first connected portion of the suspension arm includes a bush having a through hole penetrating between both end surfaces of the bush parallel to each other. The bracket includes a pair of bracket pieces arranged to face each other so that the bush is sandwiched between both end faces of the bush. Each of the pair of bracket pieces is formed with an elongated hole extending from the first position to the second position outside the first position in the vehicle width direction. Each of the pair of bracket pieces is a fastening shaft that is generated when the bolt shaft portion of the bolt / nut fastening body is inserted into the through hole of the bush and the respective elongated holes of the pair of bracket pieces and screwed with the nut portion. Each of the pair of bracket pieces holds the bush by force and the fastening shaft force is smaller or eliminated when the bolt shaft portion is in the second position than when it is in the first position in the elongated hole. A plate thickness in the axial direction of the bolt shaft portion is set. The bushing is designed so that the bolt shaft part of the bolt / nut fastening body is connected to each of the pair of bracket pieces when the collision load at the time of the vehicle collision acts on the front wheel and the suspension arm receives a specific load including the load in the rear direction of the vehicle. The behavior of the bolt shaft portion is regulated and induced so as to move from the first position to the second position against the frictional force generated by the fastening axial force in the elongated hole.

  According to this suspension device, in a normal state (before a vehicle collision), the bolt shaft portion of the bolt / nut fastening body is present in the first position in each elongated hole of the pair of bracket pieces. By screwing the nut portion and the nut portion, an initial setting state in which the bush is fastened and fixed to the pair of bracket pieces can be formed. In this initial setting state of the suspension device, a vehicle collision occurs, and a load that urges the bush outward in the vehicle width direction is a frictional force generated between the bolt and nut fastening body and the outer surfaces of the pair of bracket pieces, When the combined force of the frictional forces generated between the opposing surfaces (inner surfaces) of the pair of bracket pieces and the both end surfaces of the bush is overcome, the bolt shaft portion of the bolt / nut fastening body has the first inside the elongated hole of each bracket. Move from position to second position. At this time, when the bolt shaft portion moves to the second position in the long hole of the bracket, the fastening axial force for fastening and fixing the bracket and the bush is released. Therefore, when the bolt shaft portion is in the second position, the load used to counter the frictional force due to the fastening shaft force in the first position among the loads acting on the bush at the time of the vehicle collision is The shaft portion can be used as a load for breaking the hole edge of the bracket. At this time, the bracket breaks when the load acting on the suspension arm at the time of the vehicle collision exceeds the load necessary to break the bracket at the hole edge of the elongated hole. Accordingly, since the bush of the first connected part is completely detached from the bracket (suspension member) together with the bolt / nut fastening body, the suspension arm can be rotated outwardly with the front wheel around the second connected part. it can.

  In this case, by pushing the front wheel out of the front wheel house, the front wheel can be prevented from becoming an input source for crushing the cabin, and the space of the wheel house where the front wheel was present can be absorbed. It can be used as a space for As a result, the impact can be absorbed by the vehicle body skeleton before the wheel house is completely crushed in the small overlap collision, and the deformation of the cabin can be suppressed. Further, the separation distance in the vehicle width direction between the collision object moving integrally with the front wheels and the suspension member is increased by the outer rotation of the suspension arm, and the cabin is pushed forward obliquely away from the collision object. As a result, it is possible to reduce the collision load acting on the cabin during the small overlap collision.

  As described above, according to the present invention, there is provided a vehicle suspension device that is effective in avoiding a large collision load from being applied to the cabin during a small overlap collision of the vehicle.

FIG. 1 is a diagram schematically showing a configuration of a vehicle suspension apparatus 10 according to the present invention. FIG. 2 is a view of the first arm coupling mechanism 11 in FIG. FIG. 3 is a view showing a cross-sectional structure of the first arm coupling mechanism 11 in FIG. FIG. 4 is a perspective view of the bracket 31 in FIG. FIG. 5 is a side view of the bracket 31 in FIG. FIG. 6 is a view showing the shape of the long hole 35 provided in the bracket piece 33 of the bracket 31. 7A and 7B are views showing a state in which the bolt / nut fastening body 25 is moved relative to the bracket 31 from the initial position to the intermediate position. FIG. 7A corresponds to FIG. 2 and FIG. It corresponds to. FIG. 8 is a view showing a state in which the bolt / nut fastening body 25 is further moved relative to the bracket 31 from the intermediate position in FIG. 7, in which (a) corresponds to FIG. 2 and (b) This corresponds to FIG. 9 is a view showing a state in which the bracket 31 is broken by the bolt shaft portion 25b of the bolt / nut fastening body 25. FIG. 9A corresponds to FIG. 2, and FIG. 9B corresponds to FIG. Yes. FIG. 10 is a diagram illustrating an operation of the suspension device 10 at the time of a small overlap collision. FIG. 11 is a diagram showing a configuration of a bracket 131 according to a modified example of the bracket 31 in FIG. FIG. 12 is a diagram showing a configuration of a bracket 231 according to a modified example of the bracket 31 in FIG.

  An embodiment of a vehicle suspension device (hereinafter also simply referred to as “suspension device”) according to the present invention will be described below with reference to the drawings. In the drawing, the front and rear of the vehicle are indicated by arrows X1 and X2, respectively, the left and right sides of the vehicle are indicated by arrows Y1 and Y2, and the upper and lower sides of the vehicle are indicated by arrows Z1 and Z2, respectively. ing. These directions can be applied to the suspension device in a state before being assembled to the vehicle body and the suspension device in a state after being assembled to the vehicle body.

  As shown in FIG. 1, the suspension device 10 of this embodiment includes a suspension arm (also referred to as “lower arm”) 20 and a suspension member 30. The suspension device 10 is disposed in front of the vehicle X1 with respect to the cabin 60, which is a cabin component. The suspension apparatus 10 can be typically configured as a press-molded product of a metal material, or as a structure in which a plurality of metal elements are integrated by bonding.

  The suspension arm 20 is interposed between the suspension member 30 and the knuckle of the right front wheel 50. The suspension arm 20 includes a first connected portion 21 and a second connected portion 23 on the suspension member 30 side, and a third connected portion 24 on the right front wheel 50 side.

  The first connected portion 21 is a front connecting portion provided in front of the vehicle with respect to the second connected portion 23, and is connected to the suspension member 30 via the first arm connecting mechanism 11. The second connected portion 23 is a rear connecting portion provided behind the first connected portion 21 and is connected to the suspension member 30 via the second arm connecting mechanism 12. The first arm coupling mechanism 11 and the second arm coupling mechanism 12 are configured using a bush 23a including an elastic member (typically a member made of a rubber material) and a known bolt / nut fastening body. The third connected portion 24 is connected to a knuckle (not shown) of the right front wheel 50 at the ball joint 24a. The suspension member 30 is fixed to the vehicle body directly or indirectly through a vibration isolating member such as an insulator. The suspension arm 20 and the suspension member 30 here correspond to the “suspension arm” and “suspension member” of the present invention, respectively. A knuckle arm (not shown) of the right front wheel 50 is connected via a steering tie rod 40 to a steering gear box (not shown) that operates in response to a steering operation.

  As shown in FIG. 2 or FIG. 3, the first arm coupling mechanism 11 is fixed to the bush 22 provided in the first coupled portion 21 and the suspension member 30 and holds the first coupled portion 21. And a known bolt / nut fastening body 25 for fastening and fixing the bushing 22 and the bracket 31 to each other.

  The bolt / nut fastening body 25 includes a bolt head portion 25a, a bolt shaft portion 25b extending from the bolt head portion 25a, and a nut portion (including a washer or the like) 25c that can be screwed into the bolt shaft portion 25b. Has been.

  The bush 22 includes an elastic member (typically a member made of a rubber material), and has a through hole 22c penetrating between both end surfaces 22a and 22b of the bush parallel to each other. The bolt shaft portion 25b of the bolt / nut fastening body 25 is inserted into the through hole 22c.

  The bracket 31 includes a main body portion 32 fixed to the suspension member 30, a pair of flat plate-like bracket pieces 33 and 34 extending from the main body portion 32 toward the extended end region 31a while being spaced apart from each other in parallel. It has. The flat portions of the bracket pieces 33 and 34 both extend in the vehicle vertical direction Z1 and Z2 (see FIG. 1). The bracket pieces 33 and 34 are arranged to face each other so as to sandwich the bush 22 between the bush end faces 22a and 22b. A partition region 31 b partitioned by the bracket pieces 33 and 34 is configured as a space for holding the bush 22. An elongated hole 35 and an elongated hole 36 are formed in the planar portions of the bracket pieces 33 and 34, respectively. Both the long hole 35 and the long hole 36 are formed so as to communicate with the through hole 22c of the bush 22 in a state where the bush 22 is disposed in the partition region 31b. Each of the long hole 35 and the long hole 36 has a shape that exceeds the shaft diameter of the bolt shaft portion 25b and is smaller than the outer diameter of the bolt head portion 25a and the nut portion (including a washer) 25c. Therefore, the bracket 31 has the bolt shaft portion 25b of the bolt / nut fastening body 25 together with the through hole 22c of the bush 22 and the elongated holes 35, 36 of the bracket pieces 33, 34 in a state where the bush 22 is inserted into the partition region 31b. Is fastened and fixed to the bush 22 by a fastening axial force generated by being screwed into the nut portion 25c. Thereby, the bracket pieces 33 and 34 of the bracket 31 hold the bush 22. In this case, the repulsive force of the bush 22 against the bolt axial force always acts on both the bracket pieces 33 and 34. This bracket 31 corresponds to the “bracket” of the present invention.

  As shown in FIGS. 5 and 6, the outer surfaces of the bracket pieces 33 and 34 of the bracket 31 both have step surfaces. More specifically, the outer surface of the bracket piece 33 includes a first flat surface 33a, a second flat surface 33c that extends closer to the bracket piece 34 than the first flat surface 33a in the extended end region 31a, and a first flat surface 33c. And an inclined inclined surface 33b connecting the flat surface 33a and the second flat surface 33c. Similarly, the outer surface of the bracket piece 34 includes a first plane 34a, a second plane 34c that extends closer to the bracket piece 33 than the first plane 34a in the extended end region 31a, and a first plane 34a. And an inclined surface 34b connecting the second plane 34c. Thus, in the bracket 31, the separation distance between the outer surface of the bracket piece 33 and the outer surface of the bracket piece 34 in the axial direction of the bolt shaft portion 25b (hereinafter also referred to as “outer surface separation distance”) is the first plane 33a, The outer surface separation distance D2 in the second planes 33c and 34c is smaller than the outer surface separation distance D1 in 34a. On the other hand, in the bracket 31, the inner surfaces of the bracket pieces 33 and 34 are both flat surfaces. In other words, the plate thickness of the bracket piece 33 (the plate thickness in the axial direction of the bolt shaft portion 25b) is smaller in the portion corresponding to the third plane 33c than in the portion corresponding to the first plane 33a. Similarly, the plate thickness of the bracket piece 34 (the plate thickness in the axial direction of the bolt shaft portion 25b) is smaller in the portion corresponding to the third plane 34c than in the portion corresponding to the first plane 34a.

  As shown in FIG. 6, the long hole 35 of the bracket piece 33 is a long hole extending from the first position to the second position outside the first position in the vehicle width direction. The long hole 35 includes three first hole portions 35a, second hole portions 35b, and third hole portions 35c that are continuous in the longitudinal direction.

  The first hole portion 35a is a substantially circular hole portion formed at the position of the first flat surface 33a of the bracket piece 33, and has a hole diameter d1 that exceeds the shaft diameter of the bolt shaft portion 25b. The second hole portion 35b is formed at the position of the first flat surface 33a of the bracket piece 33 so as to connect the first hole portion 35a and the third hole portion 35c, and has an opening width smaller than the hole diameter of the first hole portion 35a. Have. The second hole portion 35b is effective for holding the bolt shaft portion 25b in the first hole portion 35a. Therefore, according to the second hole portion 35b, the bolt shaft portion 25b can be easily positioned, and the occurrence of poor fastening due to an assembly error of the bolt shaft portion 25b can be avoided. The third hole portion 35c is a hole portion formed over three locations of the first flat surface 33a, the inclined surface 33b, and the second flat surface 33c of the bracket piece 33, and has an opening width d2 of the same size as the hole diameter d1 and a hole diameter. an opening length d3 greater than d1. Therefore, the bolt shaft portion 25b of the bolt / nut fastening body 25 can move in the elongated hole 35 from the first hole portion 35a to the third hole portion 35c through the second hole portion 35b when receiving a strong load. .

  The elongated hole 36 of the bracket piece 34 has the same shape as the elongated hole 35 of the bracket piece 33. That is, the long hole 36 includes a first hole 36a having the same shape as the first hole 35a, a second hole 36b having the same shape as the second hole 35b, and a third hole 35c, which are continuous in the longitudinal direction. And a third hole portion 36c having the same shape as the above. Further, the long hole 36 of the bracket piece 34 is provided at a position facing the long hole 35 of the bracket piece 33.

  The bolt / nut fastening body 25 is disposed at a portion of the bracket 31 whose outer surface separation distance is D1 at an initial position indicated by a solid line in FIG. At this time, the bolt shaft portion 25 b of the bolt / nut fastening body 25 is engaged with both the first hole portion 35 a of the elongated hole 35 and the first hole portion 36 a of the elongated hole 36. That is, the bolt shaft portion 25b exists at the first position in the long holes 35 and 36 of the pair of bracket pieces 33 and 34, respectively. In this case, the fastening axial force generated when the bolt shaft portion 25b of the bolt / nut fastening body 25 is screwed with the nut portion 25c becomes a pressing load that presses both the bracket pieces 33 and 34 toward each other. For example, when the suspension arm 20 receives a load in a normal environment such as when the vehicle travels normally (before a vehicle collision) or when the vehicle is transported in a product state, the pressing load is applied to the bush 22 against the bracket 31. The size is set so as to prevent relative movement. Accordingly, the relative movement of the bush with respect to the bracket 31 does not occur under a normal environment. Even if the bolt shaft portion 25b moves in the elongated hole 35 to the third hole portion 35c under a normal environment, the movement of the bolt shaft portion 25b is restricted by the hole edges 35d and 36d of the bracket pieces 33 and 34. There is no possibility that the bolt shaft portion 25b is detached from the elongated holes 35 and 36.

  On the other hand, the bolt / nut fastening body 25 has an outer surface separation distance of D2 (<D1) in the bracket 31 at a position moved in the direction of the arrow from the initial position in FIG. It is placed at a certain site. At this time, the bolt shaft portion 25 b of the bolt / nut fastening body 25 is engaged with both the third hole portion 35 c of the elongated hole 35 and the third hole portion 36 c of the elongated hole 36. In this case, since the bolt / nut fastening body 25 is engaged with a portion where the thickness of the bracket pieces 33 and 34 is relatively small, the opposing portion between the outer surface of the bracket piece 33 and the nut portion 25c, and the bracket piece A gap is formed in the facing portion between the outer surface of 34 and the bolt head 25a. Therefore, the fastening axial force generated by the bolt / nut fastening body 25 is smaller than that in the initial position (substantially becomes zero).

  In the suspension device 10 having the above-described configuration, a mode in which the collision target object 100 collides with, for example, the right front portion of the vehicle traveling in front of the vehicle X1 is assumed (a mode referred to as a so-called “small overlap collision”). Typically, the collision target object 100 includes fixed vehicles such as walls, pillars, guide rails, and buildings, as well as vehicles other than the host vehicle. When a collision load F (see FIG. 1) acts on the right front wheel 50 from the collision object 100 and the suspension arm 20 receives a specific load including a rear load to the vehicle rear X2, the suspension arm 20 is second coupled. The bush 22 of the first connected portion 21 receives a force toward the outer side in the vehicle width direction (the direction away from the bracket 31) with respect to the bracket 31 in order to rotate outward in the vehicle width direction around the portion 23 ( Energized). At this time, the load urging the bush 22 outward in the vehicle width direction is caused by the frictional force Fa generated between the bolt / nut fastening body 25 and the outer surfaces of the bracket pieces 33 and 34 of the bracket 31, the bracket pieces 33, When the force combined with the frictional force Fb generated between the opposing surface (inner surface) 34 and the both end surfaces 22a and 22b of the bush is overcome, the bolt shaft portion 25b of the bolt / nut fastening body 25 is the oblong hole of the bracket 31. 35, 36 moves from the first position to the second position. That is, a part of the load acting on the suspension arm 20 is consumed as a load that opposes both the frictional force Fa and the frictional force Fb. The bush 22 regulates and guides the behavior of the bolt shaft portion 25b so that the bolt shaft portion 25b of the bolt / nut fastening body 25 moves from the first position to the second position against the frictional force. At this time, the bolt shaft portion 25b pushes the second hole portions 35b and 36b in the long holes 35 and 36 in the process of moving toward the second position.

  When the bolt shaft portion 25b moves to the second position within the long holes 35 and 36 of the bracket, the fastening axial force for fastening and fixing the bracket 31 and the bush 22 is lowered. Therefore, when the bolt shaft portion 25b is in the second position, the load used to counter the frictional force at the first position among the loads acting on the bush 22 at the time of the vehicle collision is used as the bolt shaft portion. 25b can be used as a load for breaking the bracket 31 at the hole edges 35d and 36d of the long holes 35 and 36.

  More specifically, when the bolt / nut fastening body 25 moves relative to the bracket 31 from the initial position shown in FIGS. 2 and 3 to the intermediate position shown in FIG. 7, a predetermined fastening axial force by the bolt shaft portion 25b is obtained. Is maintained on both bracket pieces 33 and 34. However, when the bolt / nut fastening body 25 further slides on the outer surface of the bracket 31 until it reaches the second plane 33c through the first plane 33a and the inclined plane 33b of the bracket 31, the intermediate position shown in FIG. 8, the fastening axial force acting on both bracket pieces 33 and 34 of the bracket 31 is weakened or the fastening axial force is not generated (becomes zero). That is, when the bolt / nut fastening body 25 moves away from the portion of the bracket 31 where the outer surface separation distance is D1 and moves to the portion where the outer surface separation distance is D2, both the bracket pieces 33 and 34 are pressed in a direction approaching each other. The pressing load is reduced or eliminated.

  Accordingly, a part of the load acting on the bush 22 at the time of the vehicle collision is no longer consumed as a load that opposes both the frictional force Fa and the frictional force Fb, and acts on the bushing 22 at the time of the vehicle collision. The total load is used as a load for pulling the bush 22 away from the bracket 31. When this load exceeds the load necessary to break the bracket 31 at the hole edges 35d and 36d of the long holes 35 and 36, the bracket 31 is broken as shown in FIG. In this case, the bush 22 of the first connected portion 21 is completely detached from the bracket 31 (suspension member 30) together with the bolt / nut fastening body 25. On the other hand, the second arm coupling mechanism 12 is configured such that the coupling rigidity between the second coupled portion 23 and the suspension member 30 is maintained even when a collision load F (see FIG. 1) acts on the right front wheel 50. ing. Further, the connection between the knuckle arm of the right front wheel 50 and the steering tie rod 40 is maintained.

  At this time, the suspension arm 20 is abducted clockwise toward the vehicle rear X2 together with the right front wheel 50 with the second connected portion 23 as the rotation center in a state where the first connected portion 21 is detached from the suspension member 30. (Also referred to as “rotation”). That is, a part of the load received by the suspension arm 20 is used (converted) for the rotation operation of the suspension arm 20. In this case, by pushing the right front wheel 50 out of the wheel house of the right front wheel, it is possible to prevent the right front wheel from becoming an input source for crushing the cabin 60, and the wheel where the right front wheel 50 was present. The house space can be used as a shock absorbing space. As a result, the impact can be absorbed by the vehicle body skeleton before the wheel house is completely crushed in the small overlap collision, and the deformation of the cabin 60 can be suppressed. Furthermore, the separation distance in the vehicle width direction between the collision target object 100 moving integrally with the right front wheel 50 and the suspension member 30 is increased by the outer rotation of the suspension arm 20, and the cabin 60 is inclined so as to move away from the collision target object 100. Pushed forward. As a result, it is possible to reduce the collision load that acts on the cabin 60 during the small overlap collision.

  The present invention is not limited to the above exemplary embodiment, and various applications and modifications are possible. For example, each of the following embodiments to which the above embodiment is applied can be implemented.

  As for the shape of the long holes 35 and 36 of the bracket 31, another shape can be adopted. For example, instead of the long hole 35 of the bracket 31, a long hole 131 of the bracket 131 shown in FIG. The long hole 131 is configured as one opening having a constant opening width from the first position 135a to the second position 135b.

  In the bracket 31, the thickness of each of the bracket pieces 33 and 34 is smaller in the second portion corresponding to the third planes 33c and 34c than in the first portion corresponding to the first planes 33a and 34a. Although described, in the present invention, the thickness of either one of the bracket pieces 33 and 34 can be made smaller in the second part than in the first part.

  In the bracket 31 described above, the planar portions of the pair of bracket pieces 33 and 34 both extend in the vehicle vertical direction. However, in the present invention, the direction in which the planar portions of the bracket pieces extend is limited to this. Is not to be done. For example, a bracket configured such that the plane portion of each bracket piece extends in the vehicle front-rear direction, or the plane portion of each bracket piece extends in a direction that intersects the vehicle vertical direction or the vehicle front-rear direction. A configured bracket can also be employed.

  The axial direction of each bolt shaft portion of the pair of bracket pieces so that the fastening axial force is smaller when the bolt shaft portion is at the second position than when the bolt shaft portion is at the first position in the elongated hole. In view of the gist that the thickness of the bracket 231 shown in FIG. 12 can be adopted instead of the brackets 31 and 131 having the above-described configuration. In the bracket 231, the outer surfaces of the bracket pieces 33 and 34 are both flat surfaces, whereas the inner surfaces of the bracket pieces 33 and 34 both have step surfaces.

  More specifically, the separation distance between the inner surface of the bracket piece 33 and the inner surface of the bracket piece 34 (hereinafter also referred to as “inner surface separation distance”) is larger than the inner surface separation distance D3 in the first planes 33a and 34a. The inner surface separation distance D4 in the two planes 33c and 34c is smaller. In this case, when the bush 22 inserted in the partition region 31b of the bracket 31 moves to the extended end region 31a together with the bolt shaft portion 25b that moves in the elongated holes 35 and 36, the compressive load on the bush 22 decreases. That is, when the bush 22 moves from the position where the inner surface separation distance is D3 to the position where the inner surface separation distance is D4, the opposite portion between the inner surface of the bracket piece 33 and the bush end surface 22a, or the inner surface of the bracket piece 34 and the bush end surface 22a. A gap is formed in a portion facing the portion facing the. Accordingly, the fastening axial force generated by the bolt / nut fastening body 25 is reduced or eliminated by the movement of the bush 22. As a result, when this bracket 231 is employed, it is possible to obtain the same operational effects as when the brackets 31 and 131 are used.

  In the present invention, the connection structure in the first connected portion 21 of the suspension arm 20 is similarly applied to the second connected portion 23 and the third connected portion 24 in addition to the first connected portion 21. can do.

  DESCRIPTION OF SYMBOLS 10 ... Suspension apparatus, 20 ... Suspension arm, 21 ... 1st to-be-connected part, 22 ... Bush, 23 ... 2nd to-be-connected part, 25 ... Bolt and nut fastening body, 30 ... Suspension member, 31 ... Bracket, 33, 34 ... Bracket piece, 35,36 ... Long hole, 50 ... Right front wheel, 60 ... Cabin

Claims (1)

A suspension member fixed to the vehicle body,
A knuckle for supporting a front wheel and the suspension member are interposed between the first connected portion connected to the suspension member and connected to the suspension member at the rear of the vehicle relative to the first connected portion. A suspension arm having a second connected portion,
A bracket fixed to the suspension member and holding the first connected portion of the suspension arm;
In a vehicle suspension apparatus including:
The first connected portion of the suspension arm includes a bush having a through hole penetrating between both end faces of the bush parallel to each other.
The bracket includes a pair of bracket pieces arranged to face each other so as to sandwich the bush between both end surfaces of the bush;
Each of the pair of bracket pieces is formed with a long hole extending from the first position to the second position outside the first position in the vehicle width direction,
In each of the pair of bracket pieces, a bolt shaft portion of a bolt / nut fastening body is inserted into the through hole of the bush and the long hole of each of the pair of bracket pieces, and is screwed into the nut portion. The fastening axial force is smaller when the bush is held by the fastening axial force generated by the shaft and the bolt shaft portion is in the second position than when the bolt shaft portion is in the first position in the elongated hole. The plate thickness in the axial direction of each of the bolt shaft portions of the pair of bracket pieces is set so as to disappear,
The bush is configured so that the bolt shaft portion of the bolt / nut fastening body is the pair when the collision load at the time of a vehicle collision acts on the front wheel and the suspension arm receives a specific load including a load in the rear direction of the vehicle. A vehicle that regulates and guides the behavior of the bolt shaft portion so as to move from the first position to the second position against the frictional force generated by the fastening axial force in each of the elongated holes of the bracket piece. Suspension device.

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